you need to purchase a USB-eLicenser dongle (aka The Steinberg Key), sold by many music stores (~$25) and transfer the licenses to the dongle.You can then use the dongle on any computer on which the Arturia software instruments are installed. Obviously, you can only run them on one computer at a time.More information (including a video showing how to transfer licenses) available from:http://www.arturia.com/evolution/en/support/elicenser.html